Cover for traps, &amp;c.



P.'C. GIBSON. COVER FOR TRAPS, Km. APPucAnoN FILED AUG.5. 191a.

Patented July 10, 191?,

ATTORNEY PERCY G. GIBSON, 0F WAUKEGAN, ILLINOIS.

COVER FOR TRAPS, 850.

Original application filed March 13, 1916, Serial No. 83,959.

Specification of Letters Patent.

Patented July 10, 1917.

Divided and this application filed August 5,

1916. Serial No. 113,392.

Y '0 all whom it may concern:

Be it known that 1, Penny (l. (lesson, a citizen of the United States,residing at \Vaukegan, in the county of Lake and State of Illinois, haveinvented a new and useful Cover for Traps, &c., of which the followingis a specification.

The present invention relates to trap covers, particularly of the screwtype, and is a division of the subject-matter set forth in applicationSerial No. 83,959, filed March 13, 1916, for a screw cover for traps.

The obj eet of this invention is to provide a trap cover of suchconstruction that it may be readily and economically manufactured, andmay be easily applied and removed when in use.

To accomplish the above object the present invention provides a trapcover which has a cover plate made separately and independently of thethreaded flange or plug portion, so that these separate parts may bemade of different materials, and so that in casting, less scrap will beproduced, as in manufacturing the present forms of trap covers the metalis frequently mis-run, is burnt by becoming too hot, and is frequentlychilled before it covers the surface of the mold.

The invention will be best understood from a consideration of thefollowing detailed description, taken in connection with theaccompanying drawing, forming part of this specification with thefurther under-. standing that while the drawing shows a practical formof the invention, the latter is not confined'to strict conformity withthe showing of the drawing, and the invention is not limited to the usemade of the cover, but the construction may be changed and modified solong as such changes and modifications come within the scope of theappended claims.

In the drawing Figure 1 is a vertical central. section taken through atrap cover constructedaccording to the present invention.

Fig. 2 is a. bottom plan view of the same.

Fig. 3 is a detail perspective view of the cover plate, the interposedpacking gasket, and the screw plug, showing these parts separated intheir respective superposed positions.

Referring to this drawing, wherein like parts are designated by similarnumerals of reference throughout the several views, 10 designates acover plate preferably of circular form. This cover plate is preferablymade of a steel disk having flat upper and lower faces. For the purposeof protecting this cover plate 10, and also for ornamenting the same, itmay be copper or nickel plated; but it may, of course, be made ofaluminum, sheet brass, or any alloy, or ma terial found suitable for thepurpose. The central portion of this cover plate or disk 10 has anon-circular opening 11 therein, which is shown as of rectangular form.

Arranged immediately beneath the cover plate 10 is a gasket 12 of diskform, and. of a diameter less than that of the cover plate 10. Thisgasket 12 is preferably of fiber, although any other suitable materialmay be used. The central portion of the gasket 12 has a non-circularopening 13 therein, which conforms in size and shape to the opening 11in the cover plate 10, and is adapted to register therebeneath. Thegasket 12 is adapted to seat on top of a trap and be held flatthereagainst by the projecting edge or flange of the cover plate.

In lieu of the usual integral depending flange commonly formed on coverplates, the present invention provides a separate and independent screwplug 14-, which, as shown in the drawing, comprises an annular or ringmember externally and peripherally threaded at its lower portion, as at15, and having its upper portion integral and flush with the spider arms16 radiating from a central web or socket portion 17. The web or socketportion 17 as shown in Fig. 3, is substantially rectangular in form, andprovides a central opening 18 of the size and contour of the openings 11and 13 in the cover plate and the gasket, and arms of substantiallyuniform width at the different sides and about the opening 18.

For firmly uniting these members and turning the same as a unit whenscrewing the plug into a trap opening, and when removing the plugtherefrom, a stud bolt is provided. This bolt has an angularly facedhead 19 upon its upper end which is adapted to seat upon the upper faceof the cover plate 10, project thereabove, and receive the jaws of awrench, to manipulate the screw cover. The stud bolt has an an ularshank 20 immediately adjacent andbeneath the head 19, said shank beingof a size and form to fit snugly into the openings 1 1 13 and 18provided respectively in the cover plate 10, the gasket 12, and thescrew plug 1 1.

The lower extremity of the shank of the stud bolt is reduced in diameterand is threaded, as at 21, the threaded extremity projecting downwardlybelow the Spider 16 of the screw plug. A binding or clamping nut 22 isthreaded upon the lower extremity 21 of the stud bolt. This nut has aconcaved inner face 23 formed by the dishing out of the upper or innerside of the nut 22 to provide the nut with a peripheral flange. The nut22 is of a diameter sufficient to extend its flange beyond the angularshank 20, the latter projecting within the concavity of the nut 22 whenthe nut is tightened and the spider 16 is forced up- 20' wardly over theshank 20. Provision is thus made for takingup any wear or compression ofthe gasket 12 without sacrificing the strength of the stud bolt,and'without providing separate means for locking the screw plug 14 fromrotation with the stud bolt.

\Vhen the head 19 is turned to screw the cover into or out of a trapopening, the angular shank 20, which engages in the angular openings ofthe three members, carries with it these three members. Thus, the threemembers are held from relative movement when the screw plug is turnedeither into or out of the trap opening.

It will also be noted, particularly from Fig. 1, that the spider 16 andthe web 17 of the screw plug are integral with the upper end of theplug, and thereby impart a cup like shape to the screw plug. This formis provided for the purpose of reducing the weight and amount ofmaterial of the screw plug. A relatively flat trap cover is therebyprovided which may be conveniently handled, packed and shipped.

As the packing gasket 12 is of disk form and clamped between the screwplug 14.- and the cover plate 10, the gasket is always held in place,does not have to be distorted and stretched over the screw plug as isdone in th present type of trap covers, and is always in proper positionfor seating on the trap.

lVhat is claimed is 1. A cover comprising a plate, a gasket of lessdiameter arranged against the'underside of the same, a screw plug ofless diameter than the gasket and positioned against the latter, and aseparate-bolt connecting the plate and the screw plug to bind the partstogether and permit the members of the cover to be turned as a unit,said bolt having its outer end formed with a polygonal head which bearsupon the plate.

2. In a device of the character described, an annular plug provided witha bolt opening, a gasket of disk form mounted upon and against said plugclosing the end thereupon said plate, extending through said openingsand provided with means at its opposite end' for clamping said plate andV gasket to th plug.

3. A cover comprising a plate provided with an angular opening throughthe cen-.

tral portion thereof, an externally threaded plug having a flat upperface and an'angu lar opening formed therethrough, a gasket .of disk forminterposed'between the plate and the screw plug and having an angularopening therethrough, said gasket being-of greater diameter than saidplug and. lying flat against the lower face of said. plate, a boltpassed downwardly through said openings in the respective members,having an,

angular head upon its upper end adapted to bind against the upper faceof the plate, and having an angular shank adapted to fit snugly in saidangular openings to hold the plate,'the gasket,v and the screw plug fromturning about the bolt, and means provided upon the lower end of thebolt and engaging against the lower side of said plug to force the sameupwardly against the gasket and bind plate.

4. A cover comprising a flat plate having an angular opening at itsmiddle portion, a packing disk fitting against the under side of theplate to provide a gasket therefor and having an angular opening throughthe central portion thereof, a flat ring-having exthe latter against theternal peripheral screw threads and inwardly extending spider arms, a"S0ket frame joining the inne'rends of the spider arms at the centralportion of the ring and having an angular opening there'through, a studbolt having an angular shank for engagement downwardly through saidopenings in the plate, the gasket and the socket frame to hold all ofsaid members from turning about the bolt, and .a binding nut threadedupon the lower end of 'the bolt and adapted to bind upwardly against thesocket frame to thus hold the members together, said bolt also having aWrench receiving head upon its upper end seating upon the upper face ofsaid plate whereby through, an externally threaded plug-hav- Z ing aflat upper face and an angular'centr-al opening therethrough,.a gasketof disk plug, the nut having a'concavity in its inner face of sufficientdiameter to receive the adj acent end of said angular shank upon thecompression of said members.

In testimony, that I claim the foregoing as my own, I have heretoaflixed my signature in the presence of two witnesses.

PERCY C. GIBSON.

Witnesses HUTTON GIBsoN, DOROTHY LEVERSEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G."

